provide maximum personal protection from electrical shock. A GFCI is not
suitable for use with certain portable test equipment.
Ground
A large conducting body, such as the earth or an electric circuit connected
to the earth, used as an arbitrary zero of potential. A ground is often used as
the common wiring point or reference in a circuit.
Ground Plane
Earth or negative rail of a circuit and a considerable mass that presents the
effect of earth (ground) to a signal.
H
Handshaking
Exchange of signals (usually part of a communications protocol) between
two devices to establish a connection.
Henry
Basic unit of inductance.
Hertz
Number of cycles per second for any periodic waveform (measured in
cycles per second). One hertz is equal to one cycle per second.
I
Impedance
Impedance is similar to resistance but applies to alternating current circuits
and is measured in ohms (represented by the symbol “Z”).
Input
The part of a circuit that accepts a signal for processing.
Insulator
Material that resists the flow of current.
Interface
Usually the hardware that provides communication between various items
of equipment using common physical interconnection characteristics,
signal characteristics, and meanings of interchanged signals.
Inverter
A device used to convert direct current into alternating current.
I/O
Input/Output.
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